ON 20140602@2:35:04 PM at page: On a web page you were interested in at: http://www.piclist.com/Techref/io/stepper/THB6064/index.htm#41781.6471412037 James Newton[JMN-EFP-786] Published and replied to post 41781.6471412037 by gcafonso |Insert 'The diodes are built in, the resistors reduce the size of the diodes required. The parts on the reset pin keep the driver from running until after the supply voltages have stabilized (some spikes on power up are pretty common in high power supplies).' at: '' gcafonso@gmail.com asks:
Why is that 4 10k resistor pulling the motors output to ground, not better a diode or nothing connected? Why those 10k and 100nf parts in the reset pin, why not link to +5V if the device claims to be safer than TB6065? Thank you!
|Delete 'P-' before: '' but after: ' http://www.hkvstar.com/technology-news/ccd-vs-cmos-in-video-surveillance-cameras.html Comparison between CCD and CMOS for video surveillance technology. ON 20140607@12:01:26 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/io/serial/i2c/withGIFs.html# James Newton[JMN-EFP-786] edited the page. Difference: http://techref.massmind.org/techref/diff.asp?url=\Techref\io\serial\i2c\withGIFs.html&version=0 ON 20140608@10:13:35 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/rainwater.htm#41798.426087963 James Newton[JMN-EFP-786] Says /Techref/other/airwater.htm Water from the Air ON 20140608@10:14:40 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41798.4268518519 James Newton[JMN-EFP-786] See also: http://books.google.com/books/about/Dew_Harvest.html?id=r52bwys37WYC Dew Harvest: To Supplement Drinking Water Sources in Arid Coastal Belt of Kutch. Girja Sharan
Foundation Books, 2006 ON 20140608@10:16:50 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41798.4283564815 James Newton[JMN-EFP-786] See also: https://www.google.com/?q=airdrop+irrigation The Airdrop irrigation system is a low-tech, self sufficient solar powered solution: an innovation bread of comprehensive investigations into rural agricultural environments, developed through working with irrigation manufacturers and local farmers, and refined by extensive prototyping with successful results. The final prototype of a scaled down unit produced close to a liter of water out of the air in a day. Further testing in a variety of conditions is necessary to confirm the results. ON 20140608@10:17:52 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41798.4290740741 James Newton[JMN-EFP-786] See also: http://en.wikipedia.org/wiki/Air_well_(condenser) An air well or aerial well is a structure or device that collects water by promoting the condensation of moisture from air.[2] Designs for air wells are many and varied, but the simplest designs are completely passive, require no external energy source and have few, if any, moving parts.

Three principal designs are used for air wells: high mass, radiative, and active. High-mass air wells were used in the early 20th century, but the approach failed.[3] From the late 20th century onwards, low-mass, radiative collectors proved to be much more successful.[3] Active collectors collect water in the same way as a dehumidifier; although the designs work well, they require an energy source, making them uneconomical except in special circumstances. New, innovative designs seek to minimise the energy requirements of active condensers or make use of renewable energy resources ON 20140609@11:06:21 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41799.9627430556 James Newton[JMN-EFP-786] See also: http://www.cnn.com/2014/04/24/tech/innovation/machine-makes-drinking-water-from-air/ Very expensive, high end, active system. Produces 65-210 gallons of potable water a day. Uses two cents' worth of electricity to produce a liter of water. ON 20140612@5:30:34 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41802.7295486111 James Newton[JMN-EFP-786] See also: http://books.google.com/books?id=eAAAAAAAMBAJ&lpg=PP1&pg=PA146 4 rigid plastic pipes, 1.25 diameter and 8' long buried between 2 and 6 feet underground collect between 6 and 21 liters a day of water when air temperatures are in the 70's and humidity in the 80's ON 20140612@6:04:00 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41802.7527777778 James Newton[JMN-EFP-786] See also: http://www.google.com/patents/US4351651 "Apparatus for extracting potable water" ON 20140612@6:08:45 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/airwater.htm#41802.7560763889 James Newton[JMN-EFP-786] See also: http://www.decatur.de Computes the dew point or frost point temperatures at a given ambient temperature and relative humidity. ON 20140616@9:11:23 AM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/language/index.htm#41806.3829050926 James Newton[JMN-EFP-786] See also: http://www.labnol.org/internet/learn-coding-online/28537/ Great list of online free programming tutorials. ON 20140617@5:55:58 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\index.htm&version=20 ON 20140617@5:58:55 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\index.htm&version=21 ON 20140617@6:00:04 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\index.htm&version=22 ON 20140617@6:15:49 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\index.htm&version=23 ON 20140617@6:16:11 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\index.htm&version=24 ON 20140617@6:20:47 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/index.htm#41390.3929398148 James Newton[JMN-EFP-786] removed post 41390.3929398148 |Delete ' Or at least a top view of the various steps being completed
  • ' ON 20140620@1:14:55 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/pcbmill.htm#41810.5520138889 James Newton[JMN-EFP-786] See also: http://www.autoleveller.co.uk/ Software to probe an uneven surface, record the z height, and then edit existing g-code files to compensate for the variations. No longer free, but probably worth the price. Web site also has lots of good information on how to configure a probe in your CNC software and how to build a good hold down table for PCB stock. ON 20140624@10:32:13 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/usbs.htm#41814.9390393519 James Newton[JMN-EFP-786] See also: https://www.technovelty.org/linux/what-actually-happens-when-you-plug-in-a-usb-device.html What actually happens when you plug a USB device into a Linux computer? ON 20140627@8:38:43 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/ideas.htm#41817.8602199074 James Newton[JMN-EFP-786] Says /Techref/other/cheapmonocoaster.htm Low cost single rail backyard train or coaster ON 20140627@8:42:24 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/cheapmonocoaster.htm#41817.8627777778 James Newton[JMN-EFP-786] Questions: This idea is a combination of this:

    with this

    The first picture is way too expensive. The second is less expensive, but I think one could improve it's stability AND perhaps further reduce the price as follows: Remove the PVC rail from one side. Rotate the "tie" on the remaining rail and stick it into the ground. Looks more like the first picture now but with a very low cost, /round/ PVC rail instead of the I-beam. The increase in number of connections to the group (vs just the few 4x4 risers) would increase stability and the savings on PVC rail and risers would pay for the extra concrete. Or perhaps even allow one to replace the risers with metal fence posts which are simple pounded into the ground. In any case, the risers would be quite numerous, spaced at some even distance... say X inches apart. Perhaps 24" or 36" The train would follow the rail with 4 scooter wheels arrayed at 10, 2, 4, and 8 o'clock...

    Ah, you say, but how will you keep the train from falling over? and it would stay upright as follows: Each car or engine in the train would be X long, where X > Y. E.g. they are all longer than the spacing of the risers. And on the bottom, each has a set of guides which rub left and right of the risers. These would be made of steel, but coated with a slippery surface e.g. teflon to reduce friction. Keep in mind, the train is setup such that as much weight as possible is /below/ the rail (batteries, motor, frame, etc...) and the load is placed as low as possible. The riders would straddle the rail, feet on either side, and would lay down or recline as on a bicycle. This greatly reduces the forces required to keep things upright.

    If further friction reduction is required, the guides would be replaced with a track or belt system like a tank or treadmill. This could also be helpful in the case of a powered train, because the risers become cogs to be grabbed by the tank/belt when moving uphill at high rates of incline. At worst, a low end scooter wheel would be added near the top of each riser. ON 20140627@8:45:45 PM at page: On a web page you were interested in at: http://techref.massmind.org/Techref/other/cheapmonocoaster.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://techref.massmind.org/techref/diff.asp?url=\Techref\other\cheapmonocoaster.htm&version=1 ON 20140630@5:52:04 PM at page: On a web page you were interested in at: http://www.massmind.org/Techref/io/stepper/THB6064/gallery.htm# James Newton[JMN-EFP-786] edited the page. Difference: http://www.massmind.org/techref/diff.asp?url=\Techref\io\stepper\THB6064\gallery.htm&version=1